Healing qualities: A crystal with many healing aspects, amethyst offers an overall protection while striking a balance in your physical, emotional and mental state. The purple crystallized quartz also magnifies the energy of other crystals, and is useful for purification during ceremonies
Physical qualities: Amethyst works by tackling the root causes of diseases such as bacterial and viral infections and aids in providing relief for headaches and migraines, while guarding against insomnia and nightmares.
Emotional/spiritual: Bringing about a calming effect, amethysts helps in soothing nerves and easing tensions and over sensitivity, including coping with strong emotional energies such as grief. It can also be used to enhance your aura and spirituality, or as an aid for meditation.
Magical and mystical qualities: Protects against paranormal harm and malice while attracting good luck.
Reference: The Crystal Healer – Philip Permutt, Crystals for Health – Cassandra Eason